Improvement in machines for forming screw-threads on sheet metal



y' 2Sheets--Sheet1. C. F. NEUBER &. F. W. PERRY.

Machines-for Forming Screw-Threads on Sheet-Metal.

No. 1115,89@I y Paten-ted nec. 23,1873.

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Patented Dec. 23,1873.

UNITED STATES PATENT OFFICE.

OHARLESF. NEUBER, OF NEW BRUNSWICK, AND FRANK W. PERRY, OF OAMDEN, ASSIGNORS TO JOHN L. MASON, OF NEW BRUNSWICK, NEW

JERSEY.

IMPROVEMENT IN MACHINES FOR FORMING SCREW-THREADS ON SHEET METAL.

Specification forming part of Letters Patent No. I 45,893, dated December 23, 1873; application filed November 6, 1873.

To all 'whom it may concern:

Be it known that we, CHARLES F. NEUEER, of New Brunswick, in the county of Middlesex, and FRANK W. PERRY, of the city and county of Camden, both of the State of New Jersey, have invented a new and useful Improvement in Apparatus for Forming Screw- Threads on Sheet-Metal Gaps; and we do hereby declare the following to be a clear and exact description of the nature thereof, sufficient to enable others skilled in the art to which our invention appertains to fully understand,

make, and use the same, reference being had to the accompanying drawings making part of this specification, in which- Figure lis a top view of the device embody- 'mg our invention. Fig. 2 is a side view thereof, one portion being in section, and another portion removed. Fig. 3 is a front view thereof. Fig. 4. is a transverse section in line .fr x, Fig. 3.

Similar letters of reference indicate corresponding parts in the several gures.

This invention relates to an apparatus for forming screw-threads on sheet-metal caps; and consists in two threading-chucks, one of Vwhich is supported on an oscillating saddle, whose axls is a shaft, which communicates motion from the shaft which rotates one chuck to the shaft on the saddle which rotates the other chuck. It also consists in an eccentric and yoke constructed to cause one chuck to dwell 7 when the threading operation is being accomplished, and also when the threaded cap is to be removed. It also consists in a removable pinion interposed between the gearing of the two chucks for adjusting the threads of the latter to mesh or nt each other. It also consists in a disk arranged at the rear of one of the chucks for holding the shell or cap on the other chuck, the disk and connected chuck thus occupying the same shaft.

-Referring to the drawings, A represents an eccentric, which is secured to a shaft, B,which has suitable bearings C, and receives power through thegearing D, in any well-known manner. `E represents a yoke, which surrounds the face of the eccentric A, and to which is connected one end of a pitman, F, whose other end is jointed to an oscillating saddle, G. The eccentric A has an irregular face, excepting the portion between the points a b, which portion is the arc of a circle Whose center is the shaft B. The inner face of the yoke E is formed with projections or bearings H H' H" H', which extend beyond said inner face and bear against the face of the eccentric A, and said projections are arranged atpoints diametrically opposite to each other. The saddle G consists, in the present case, of two arms, G' G', which are bolted .to each other, and have journaled thereto two shafts, J K, on each of which is keyed or otherwise secured a pinion, a, the two pinions meshing with each other,

and being arranged in the space between the arms or side pieces constituting the saddle. The shaft K forms the axis of the saddle, whose oscillatory motion is imparted from the eccentric A through the intermediate yoke E and the pitman F. The shaft K passes loosely through the saddle, and the end adjacent thereto has its bearings on a support or standard, L. The said shaft also extends or continues longitudinally from the saddle, and the end opposite to the saddle is properly mounted on a support or standard, M, and, if desired, on an intermediate point by a support or standard, M' 5 and said end carries apinion,N,which meshes with a pinion, P, which is removably connected to its axial pin, which is secured to the support M. Q represents a longitudinally-arranged shaft, which is mounted on the standards M M', and extends parallel with the shaft K toward the saddle G. A pinion, R, is attached to the shaft Q, at the end adjacent to the support M, and meshes With the pinion P, whereby, when power is communicated to the shaft Q by pulleys, gearing, or otherwise, as at S, the pinion R communicates motion to the pinion P, and the latter to the pinion N. The pinion P is thus an intermediate wheel, and, while it rotates freely on its axis, and is readily removable therefrom, it is held in place by a forked key, 7c, or other appliance, which embraces the grooved head of the axial pin of the pinion, and thus prevents displacement of the latter unless properly manipulated. T represents a threading-chuck, which is Secured to the inner end of the shaft Q, and U is a threading-chuck, which is attached to the inner end of the shaft J, so that the two chucks point in opposite directions, and they are so disposed as to be brought side by side. The threads of the chucks extend/in an order reverse to each other, or, iu other words, one is right-handed and the other left-handed, whereby, when the two chucksv are in contact, the thread of one chuck will enter between the threads of the other chuck. At the rear of the chuck U, on the shaft J, there is journaled a disk, V, which rotates` freely on said shaft as an axis, and occupies such a position thereon that when the saddle G oscillates, the disk will move in a line near the outer end or head of the chuck T, and parallel therewith. It will be noticed that the disk and one chuck are mounted on the same shaft. The pitman F is made in sections, which are connected by a collar, lV, whose internal face is formed with right and left threads, which engage with the correspondingly-threaded ends of the sections of the pitman, so that by rotating the collar said sections m ay bebrought together or forced apart, and thus the pitm an len gthened or sh0rtcned, for increasing and decreasing its throw or amount of oscillations of the saddle, and thereby adjust the saine for use with chucks of varying diameters for threading caps of different sizes. Jam-nuts X may be applied to the sections for tightening the collar W on the sections, and preventing unintentional movement thereof, which is important after the pit man is adjusted.

The operation is as follows: Power is applied to the shaft Q, whereby rotary motion is communicated to the chucks T U. Power is also applied to the shaft B, whereby the saddle G. receives its oscillating motion, and carries the chuck U as it rotates toward the chuck T, the shaft K not only serving as the axis of the saddle, but also communicating motion from the operating-shaft which carries the chuck T to the operating-shaft which carries the chuck U 5 and it will be noticed that the same result is always produced, whether large or small chucks are employed, it only being necessary to impart the proper degree of oscillation to the saddle relatively to the distance the chuck has to traverse to reach the chuck by adjusting the throw of the pitman F. The cap, shell, or struck-up blank is placed on the chuck T, and as the chucks are brought together it is evident that the threaded contour of the-chuckT is imparted to the blank, since the chuck U forces the metal over the threads of said chuck T. It is important that while the chucks rotate they are held together for a short while, or that there is a dwell of the chuck U as it rotates against the cap on the other chuck, for the purpose of forming perfect threads, which cannot be accomplished by the immediate withdrawal or return of the chuck. It is also important that here is a hold-up or dwell of the same chuck after the threading of the cap, in order to re'- move the same and feed the chuck T with a of the pitman, but merely to raise or lower the yoke. The pitman thus having only an axial motion, the point of attachment with the saddle forming the fulcrum or axis, the saddle dwells or is at rest, which result occurs during the threading operation, and causes complete and well-defined threading of the cap. When the arc clears the bearing H, as stated, the yoke, by the action of the eccentric on the bearing H receives its usual rising or falling and longitudinal movements, whereby the dwell ceases and the saddle is oscillated, the chuck thereon receding from the chuck T. Vhen the arc a b of the eccentric A reaches the bearing H on the portion of the yoke adjacent to the point of attachment of the pitman, the action of the eccentric on the yoke is to impart a rising or falling motion thereto without any longitudinal motion, thereby imparting an axial movement to the pitman, and consequently causing another dwell of the saddle. Advantage is taken of this dwell to remove the threaded cap from and apply a fresh shell or cap to the chuck T., L

After the dwell the chuck U, by the usual ac tion of the eccentric on the bearing H of the yoke, advances and threading again occurs, as above stated, subject to the consecutive dwell, and thus the operation continues.

It will be observed that the disk V reaches the chuck T in advance of the chuck U, so that the cap or shell placed on the respective chuck is immediately held thereon by the disk bearing against the top of the cap, and thus prevented from falling off before being reached by the chuck U, and manual assistance for such purpose is obviated. When the threading is perfected and thechucks are separated, the disk moves laterally from the chuck T, whereby there is no obstruction longitudinally to the removal of the threaded cap, and thus such removal may be quickly performed. During the threading operation the disk rotates freely, and thereby prevents scraping or crimping of the top of the cap. The chucks must be so adjusted that the thread of one chuck will sit and rotate between the threads of the other chuck. Now, as it is evident that the two chucks are so geared that if one is rotated the other will likewise be rotated, and adjustment could not be made, it is essential that one chuck may have a motion independent of the other. To accomplish this is the object of the interina diate pinion P.

It will be noticed that the pinion N of the shaft K and pinion R of the shaft Q do not mesh with each other, but are geared to each` said pinion P, the shaft Q maybe turned without turning the shaft K consequently the chuck T may be rotated without rotation of the chuck U. When the chucks are brought together, and it is perceived that the thread of one chuck does not enter between the thread of the other chuck, or the surfaces of the two threads are in contact, then the shaft Q is turned untilthe threads of the two chucks will occupy the proper position, or, in other words, mesh. The pinion P is then applied to its axial pin and geared with the pinions N R, care being first taken not to disturb the pinion N. The chucks, being thus again connected by the intermediate gearing and shafting, retain their adjusted I), and the yoke E, formed with the projecting bearings H H H H, constructed to impart an oscillatory motion to the chuck-carrying saddle G and a two-part dwell thereto-one when the threading is being accomplished, and the other when the threaded cap is to be removed.

3. The adjusting-pinion P, arranged intermediate of the gearing of the two threadingchucks T U, substantially as and for the purpose set forth.

4. The holding-disk V, arranged at the rear of the chuck, on a shaft common to both, substantially as and for the purpose set forth.

CHARLES F. NEUBER. FRANK WV. PERRY. Witnesses J or-IN A. WIEDERSHEIM, J No. H. BELL.. 

